Cropping an Image with resizable and draggable rectangle

Crops the Image from a resizable and draggable rectangle & displays it (after the figure is closed)

% Crops the Image from a resizable & draggable rectangle
% & displays it (after the figure is closed)
%
% I is the Image to be cropped, assumed to be in the
% matlab workspace
%
% EXAMPLES
%
% I = imread('liftingbody.png');
% [rect_pos] = Crop_it(I);
%
% RGB = imread('peppers.png');
% [rect_pos] = Crop_it(RGB);